Author Topic: Grinding Kickstart  (Read 183 times)

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Offline Jarch

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Grinding Kickstart
« on: February 04, 2019, 08:45:31 pm »
Hello forum members....I am now the proud owner of a 1945 C10 and loving it.

She came with the usual long list of engineering anomalies. Having got her running perfectly she has now decided to slip the kickstart with a grinding noise in protest.

Reading most forum entries on kickstart I am 99% sure it is not the clutch. But no one is ever 100%

I have a feeling it is the drive pawl/spring or the gear it acts on.

Before I take the 3 speed gearbox to little pieces can someone advise if there is anything further I can try or indeed a list of parts I should go into battle with.

Thank you in advance for any help forthcoming.

Offline stev60

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Re: Grinding Kickstart
« Reply #1 on: February 04, 2019, 11:04:23 pm »
Just from my limited experience, I would be looking inside the dreaded 3 speed box and have a look at the kickstart ratchet , they wear out and slip and Im not sure how easy the part is now find, I managed to pick up another   gearbox , with a good set in it but to get mine working initially I hand filed  the worn part, like
 a few BSA parts they have to be totally stuffed before they dont work

Offline timsdad

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Re: Grinding Kickstart
« Reply #2 on: February 05, 2019, 08:06:48 am »
These gearboxes are very robust, quite simple to anyone who's got a decent understanding of mechanics, Mr J, and there is no need for any trepidation in removing the outer cover to investigate.

As Steve noted, it's probably the ratchet gears which can either be the straight teeth on the kick starter or the side-facing dog's teeth on the little pawl gear on the main shaft. You will only know by taking it apart and looking - takes about five minutes! You need to read through the BSA  hand book or Pitman/Haycraft instruction manual and all will become clear. I'm pretty sure all this information is in the relevant Technical Information section on here so is easily found. Everything wears up so don't panic if the teeth look a bit second-hand - it may just be a little spring broken or jammed on the pawl gear.

Drain the gearbox oil, loosen all the screws, remove the pedals and wriggle the outer cover off. The kickstarter shaft will likely need to be held slightly down its stroke to get it clear of the stops. I use a pair of Molegrips but the pedal can be used. Also, I think the gear pedal shaft needs pushing inwards while the cover is removed but if it all falls out with the cover it's simple enough to get everything back in its right place. All part of the fun, apparently!

It helps immensely to get the bike a foot or so up off the floor but, no doubt, you know that.


Ray
Just a motorcyclist.

Offline Jarch

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Re: Grinding Kickstart
« Reply #3 on: February 06, 2019, 09:26:29 am »
Thank you guys really appreciate it. Time to get brave!

Offline Jarch

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Re: Grinding Kickstart
« Reply #4 on: February 06, 2019, 10:45:37 pm »
Further investigation before I dismantled gearbox.....

Turns out the locking nut on the cush drive had come loose enough for me to slip the cush drive under my 16 st of prime physique.  Makes a nice grinding noise. Re- tightened with a hastily made tool to 65ftlbs and doused in locktite for good measure.

Very happy man once again.

Now about this primary drive case leak........

Offline stev60

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Re: Grinding Kickstart
« Reply #5 on: February 07, 2019, 06:10:46 am »
Probably not the place to use locktite, as long as you remember its there, next time

Offline timsdad

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Re: Grinding Kickstart
« Reply #6 on: February 07, 2019, 06:31:17 am »
In my experience, Loctite has been fine in places like this but I'll mostly use a rattle gun to remove the nuts again. You have to use the other hand to get rid of the back-lash.

Glad it's sorted, Mr J


Ray
Just a motorcyclist.